/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/MeshRefinerBase.h
Check if edge flip might create a triangle with small area (either all vertices are close together, or in a sliver configuration)
bool CheckIfFlipCreatesTinyTriangle ( int OriginalEdgeVertexA, int OriginalEdgeVertexB, int OppositeEdgeVertexC, int OppositeEdgeVertexD, int OriginalTriangleIndex ) const